CN101231455B - Apparatus for synchronism of multiple cameras using laser light splitter - Google Patents
Apparatus for synchronism of multiple cameras using laser light splitter Download PDFInfo
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- CN101231455B CN101231455B CN200810057303A CN200810057303A CN101231455B CN 101231455 B CN101231455 B CN 101231455B CN 200810057303 A CN200810057303 A CN 200810057303A CN 200810057303 A CN200810057303 A CN 200810057303A CN 101231455 B CN101231455 B CN 101231455B
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Abstract
A device is provided for synchronizing a plurality of cameras by using a laser splitter, which comprises a laser generator, optical fibers, a light splitter and photoelectric converters. A laser output from the laser generator is transferred to the light splitter via the optical fibers, the light splitter decompose the laser into multi-path lasers; the multi-path lasers output from the light splitter are individually connected to the photoelectric converters via the optical fibers; the photoelectric converters convert the laser signals into electrical pulse signals; the electrical pulse signals, as synchronous signals, externally trigger each cameras for capturing images. The quantities of the optical fiber and the photoelectric converter are determined by the quantity of the cameras. The invention has no distance limitation and solves the problems of prior art, such as interference in remote triggering with electrical pulse signals and serious signal loss.
Description
Technical field
The present invention relates to a kind of synchronous device of multiple-camera, particularly a kind of laser light splitter that utilizes carries out the synchronous device of multiple-camera.
Background technology
When adopting a plurality of video cameras to carry out the synchronous acquisition multiple image, the collection of image need be carried out the synchronous of strictness opportunity, guarantee that the user from specifying a two field picture that obtains complete and continuous constantly, could register location and successful three-dimensional reconstruction to object according to the image of gathering like this.
At present, the synchronous method of video camera be divided into outer synchronously, inter-sync (synchronous at random), power supply synchronously, the VD2 impulsive synchronization.Generally preferably video camera can have simultaneously outer synchronously, inter-sync, power supply be synchronous, even VD2 impulsive synchronization (as products such as Panasonics).The advantage of inter-sync method is simple, and shortcoming is not good synchronously.Power supply is meant the interchange homophase power supply power supply of all video cameras by Surveillance center synchronously, makes the phase locking of video camera field sync signal and civil power, to reach the method for synchronization of video camera synchronizing signal phase place unanimity.Outer being meant synchronously between the different video equipments guarantees the synchronous of vision signal with same synchronizing signal, and it can guarantee that the vision signal of different equipment output has the beginning and ending time of identical frame, row.Synchronously outer in order to realize, need import a composite synchronizing signal (C-sync) or composite video signal to video camera.Can not guarantee synchronously that outward the user from specifying a two field picture that obtains complete and continuous constantly, realize this function, must use video camera with external trigger synchronizing function.Therefore use the mode of external trigger to come synchronous a plurality of video cameras significant.Yet present external trigger mode all is based on pulse electrical signal, by synchronous generator produce synchronous electric signal and directly each video camera of input realize between multiple-camera synchronously.In fairly large video acquisition environment (as outdoor augmented reality environment), because distance, that this external trigger pulse electric signal that is produced by synchronous generator is subjected to easily is weak, interference etc. influences and can't use.
Summary of the invention
Technology of the present invention is dealt with problems and is: overcome the deficiency of prior art at aspects such as transmission range and synchronization accuracies, provide a kind of laser light splitter that utilizes to realize the synchronous device of multiple-camera.This device can realize accurately, can not be subjected to distance limit, avoid being subjected to the multiple-camera synchronizing function of electromagnetic interference (EMI) on every side.
Technical solution of the present invention: utilize laser light splitter to realize the synchronous device of multiple-camera, comprise: laser generator, optical fiber, optical splitter, photoelectric commutator, by the laser that laser generator sends, to optical splitter, optical splitter is decomposed into multi-path laser with this laser through Optical Fiber Transmission; Every road laser that optical splitter produces all is connected to a photoelectric commutator through optical fiber, and photoelectric commutator is converted to electric impulse signal with laser signal, and these electric impulse signals carry out image acquisition as each video camera of synchronizing signal external trigger.Trigger pulse of the every reception of video camera promptly expose a field picture and output.
The quantity of described optical fiber, photoelectric commutator is by the synchronous video camera number decision of needs.
Described laser generator is wanted to produce the repetition pulse laser signal identical with the desired filming frequency of video camera.
It is laser signal that described optical splitter imports one the tunnel, and its output produces and the same number of multi-path laser signal of video camera.
Described optical splitter is placed on apart from the work space of all video cameras near distance of trying one's best, and this scope is to be as the criterion outside the image pickup scope of each video camera and apart from each video camera is nearest.
Described photoelectric commutator links to each other with each video camera by cable.
Described laser generator is a pulsed laser, can produce repeatably pulsed laser signal, and pulse width is by the characteristics decision of video camera, and repetition frequency is by the frame frequency decision of camera acquisition image.
The present invention's beneficial effect compared with prior art: the present invention can realize the precise synchronization of multiple-camera, is not subjected to distance limit, avoids electromagnetic interference (EMI).The specification requirement of employed element is low among the present invention, and low price is bought easily.Video camera number that can be synchronous is unrestricted, favorable expandability.
Description of drawings
Fig. 1 is the structural representation of embodiments of the invention;
Fig. 2 is the repetition pulse laser signal synoptic diagram that laser generator of the present invention produces;
Fig. 3 is the external trigger low level signal synoptic diagram of each video camera of the present invention.
Embodiment
Below, with reference to accompanying drawing, concrete state of the present invention is explained, but the invention is not restricted to illustrated example.
As shown in Figure 1, the embodiment of the invention comprises: laser generator, optical fiber, optical splitter, photoelectric commutator.The repetition pulse laser signal that laser generator produces is sent to optical splitter as the input pulse laser signal by optical fiber, and this road pulsed laser signal that will be imported by optical splitter is divided into the multipath pulse laser signal; Every road pulsed laser signal of optical splitter output links to each other with four photoelectric commutators by optical fiber; Four photoelectric commutators carry out opto-electronic conversion to the pulsed laser signal of importing, the output pulse electrical signal; The pulse electrical signal of four photoelectric commutators output is connected to the external trigger interface of corresponding video camera by cable, and every road pulse electrical signal is responsible for triggering a video camera.
Carry out in the synchronous process of multiple-camera at the above-mentioned optical splitter that utilizes, optical splitter is a kind of optical device, have an input port and a plurality of output port, a plurality of output ports are given in the uniform beam splitting of input optical signal, and wherein number of output ports is by the number decision of video camera.Laser generator is a pulsed laser, and pulse width is by the characteristics decision of video camera, and repetition frequency is by the frame frequency decision of camera acquisition image.If the speed of camera acquisition image is f frame/second, the low level or the high level lasting time of the pulse electrical signal that the video camera external trigger needs are the μ millisecond, then the repetition frequency of the repetition pulse laser signal of laser generator generation should be set to 1/f second, the duration of the repetition pulse laser signal that produces should be set to the μ millisecond, referring to shown in Figure 2, among Fig. 2 with the trigger pip of low level as video camera.
Repetition frequency and laser duration by the control laser generator produces laser signal, produce the repetition pulse laser signal.The repetition pulse laser signal is through producing multichannel repetition pulse laser signal behind the optical splitter.Each road pulsed laser signal after photoelectric commutator carries out opto-electronic conversion, produces the multiplex pulse electric signal of strict synchronism, referring to shown in Figure 3 respectively.These pulse electrical signals trigger multiple cameras simultaneously and carry out image acquisition as all video camera external synchronization signals, realize between the video camera synchronously.
Optical splitter among the present invention is placed on the near scope of trying one's best apart from the video camera perform region, this scope is with outside the image pickup scope of each video camera, and be as the criterion apart from each video camera is nearest, with reduce single channel laser that laser generator produces in transmission course owing to too early be divided into the power transfer decay that multi-path laser is brought. on the other hand, with comparing with the cable transmission electric signal, optical signal transmission fiber has low-loss characteristics, therefore adopt optical signal transmission fiber as far as possible, reduce the distance of cable transmission electric signal, thereby reduce the ability decay that cable transmits electric signal. because laser has stronger antijamming capability, adopt the multiple-camera synchronous device of invention can reduce the energy loss that takes place owing to the longer Distance Transmission of trigger pip, reduce the probability that trigger pip is disturbed.
The quantity of employed optical fiber, photoelectric commutator, optical splitter, cable is determined as follows among the present invention: with n (n 〉=2) platform video camera is example, number of fibers is n+1, and number of cables is n, and photoelectric commutator quantity is n, optical splitter quantity is 1, and the output quantity m of optical splitter should satisfy m 〉=n.
The order of connection of each components and parts is followed successively by among the present invention: laser hole drilling illuminator, optical fiber, optical splitter, n bar optical fiber, a n photoelectric commutator, n bar cable, a n video camera, as shown in Figure 1, only illustrated to adopt four video cameras to carry out the situation of image acquisition among the figure.
It should be noted last that; the above only is a preferred implementation of the present invention; should be understood that; for those skilled in the art; utilize laser light splitter to carry out under the prerequisite of multiple-camera synchronization principles not breaking away from the present invention; can also make some improvement or be equal to replacement, these improvement and be equal to replacement and also should be considered as protection scope of the present invention.
Claims (8)
1. one kind is utilized laser light splitter to carry out the synchronous device of multiple-camera, it is characterized in that comprising: laser generator, optical fiber, optical splitter, photoelectric commutator, by the laser that laser generator sends, to optical splitter, optical splitter is decomposed into multi-path laser with this laser through Optical Fiber Transmission; Every road laser that optical splitter produces all is connected to a photoelectric commutator through optical fiber, photoelectric commutator is converted to electric impulse signal with laser signal, these electric impulse signals carry out image acquisition as each video camera of synchronizing signal external trigger, trigger pulse of the every reception of video camera promptly expose a field picture and output.
2. the laser light splitter that utilizes according to claim 1 carries out the synchronous device of multiple-camera, it is characterized in that: the quantity of described optical fiber, photoelectric commutator is by the synchronous video camera number decision of needs.
3. the laser light splitter that utilizes according to claim 1 carries out the synchronous device of multiple-camera, it is characterized in that: be provided with 1 laser generator.
4. carry out the synchronous device of multiple-camera according to claim 1 or the 3 described laser light splitters that utilize, it is characterized in that: described laser generator is wanted to produce the repetition pulse laser signal identical with the desired filming frequency of video camera.
5. the laser light splitter that utilizes according to claim 1 carries out the synchronous device of multiple-camera, and it is characterized in that: described optical splitter is input as one road laser signal, and its output produces and the same number of multi-path laser signal of video camera.
6. utilize laser light splitter to carry out the synchronous device of multiple-camera according to claim 1 or 5, it is characterized in that: described optical splitter is placed on apart from the work space of all video cameras near distance of trying one's best, and this scope is to be as the criterion outside the image pickup scope of each video camera and apart from each video camera is nearest.
7. the laser light splitter that utilizes according to claim 1 carries out the synchronous device of multiple-camera, and it is characterized in that: described photoelectric commutator links to each other with each video camera by cable.
8. the laser light splitter that utilizes according to claim 1 carries out the synchronous device of multiple-camera, and it is characterized in that: described laser generator is a pulsed laser, can produce repeatably pulsed laser signal, and pulse width is by the characteristics decision of video camera.
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| Application Number | Priority Date | Filing Date | Title |
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| CN200810057303A CN101231455B (en) | 2008-01-31 | 2008-01-31 | Apparatus for synchronism of multiple cameras using laser light splitter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN200810057303A CN101231455B (en) | 2008-01-31 | 2008-01-31 | Apparatus for synchronism of multiple cameras using laser light splitter |
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| Publication Number | Publication Date |
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| CN101231455A CN101231455A (en) | 2008-07-30 |
| CN101231455B true CN101231455B (en) | 2010-05-12 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102006420B (en) * | 2010-12-17 | 2012-02-08 | 四川川大智胜软件股份有限公司 | Design method capable of using external synchronous cameral with various data output formats |
| CN102223484A (en) * | 2011-08-04 | 2011-10-19 | 浙江工商大学 | Method and device for configuring head-end parameter of camera |
| CN102637254A (en) * | 2012-02-25 | 2012-08-15 | 杨星 | Detection system of regression reflection target |
| CN104113748A (en) * | 2014-07-17 | 2014-10-22 | 冯侃 | 3D shooting system and implementation method |
| CN106092510A (en) * | 2016-06-02 | 2016-11-09 | 余丽波 | Laser test system |
| CN113506434A (en) * | 2021-07-12 | 2021-10-15 | 福建中电能源股份有限公司 | Communication control method for electric lifting applied to hot-line work below 1100KV |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1062421A (en) * | 1990-12-15 | 1992-07-01 | 赵家伟 | A kind of stereographic method |
| CN1787608A (en) * | 2005-12-05 | 2006-06-14 | 中国科学院武汉物理与数学研究所 | Apparatus for synchronizing camera with supershort pulse laser lighting |
| CN1936700A (en) * | 2006-09-30 | 2007-03-28 | 河海大学 | Control method for synchronous shooting |
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2008
- 2008-01-31 CN CN200810057303A patent/CN101231455B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1062421A (en) * | 1990-12-15 | 1992-07-01 | 赵家伟 | A kind of stereographic method |
| CN1787608A (en) * | 2005-12-05 | 2006-06-14 | 中国科学院武汉物理与数学研究所 | Apparatus for synchronizing camera with supershort pulse laser lighting |
| CN1936700A (en) * | 2006-09-30 | 2007-03-28 | 河海大学 | Control method for synchronous shooting |
Non-Patent Citations (2)
| Title |
|---|
| 吴文佳.改善SXB-1摄像机外同步性能的方法.电视技术 12.1994,(12),52-54. |
| 吴文佳.改善SXB-1摄像机外同步性能的方法.电视技术 12.1994,(12),52-54. * |
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